4D Lambda bands - particularly elastic and resistant 4D Lambda bands are made of resistant, high-grade rubber. The resistance of these rubber bands enables you to work your muscles and antagonist muscles effectively. Please note: Lambda bands are not compatible with Lambda 1.0. The "Soft" version is ideal for people weighing up to 40 kg and can be perfectly combined with Lambda 2.0 or 3.0 bands. The bands are suitable for all those who prefer a gentler form of training (e.g. when learning new exercises). Detailed specifications: Band material: hard-wearing rubber / Standard band color: red / Soft band color: white / Recommendation: Body weight from 85 to 115 kg: 1 additional pair of Lambda Standard bands /